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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a15a6498487eee1f44711e51a23b6b4554e229fadf2089e1025ffce7f20668c5' 
  AND token = 'XR/My6uIf/xAWu5Sv7OpkLQ4TvbkCWaPBzaw7/GDAYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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