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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5c0f89829f748b8891e47c61b0495ab402125a18cc7a2968c566ef5c907a7f8' 
  AND token = '5q7UwVysgSR7fOjDRdJOUAbQ38B35LZlE64VRqSwiLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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