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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f40da06a45b8bb34d0945da54c869526dc404e3ae406c896437a3e0ab7aff111' 
  AND token = 'ccLZr3cXWH5fNlgYZoeA0iH9v9PKBVKX900uSzBfwEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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