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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca02f5fad8b05f11bfc33c5333dec8761b04a327a61fc399e75c6e6f4ef81a14' 
  AND token = 'yztyHrxT7C31tRU21ECLfRamtZDlfDMJ1sDFE3TvVhY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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