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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3a6af1d56711c89ea55b6d0ccad355e9c8dd45839ce52cfee63026c34c46b0a' 
  AND token = 'S2WkOdFr3yyHzZsBbBS9ZBDzvurOdE8VEnO1ofefTeg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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