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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb19649ce3542806511e12fa498f3d7a5b22dafb23e92c4b1f2e3e6c282b7228' 
  AND token = 'NEXJab+BUcCgbNksb4W0llVB0pjQYxEDhfTCjlRUPdw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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