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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eacc59260722faf6fe935db7208ef2d7cf76b4c0bc1c24d48c0124b71a79c91e' 
  AND token = 'kQHesu4qwomYNMRFfeb/pBhQOD01cy36uTqXfr6ds4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}