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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5c4ef9c6ad02ff731fabc81c327194bdfb014a77ac8b76e41eb23e7540cf133' 
  AND token = 'xO7djfbToS5MJtUFMZGsbKnd3EneerjWhC6GMIrCvdI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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