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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9ce14b664c0e9e6c021be44f6c3ec06716204ef04432641682f86d2b82fb32e' 
  AND token = 'pau6PYijYDyooyLk4FI4aCKiAoAjNzvx8kk9prTWQc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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