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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9eae47413840a0a545c8e964a89d515b3e716f59590e779f2c7b322b1153204c' 
  AND token = '4nwa4rfCl7zP+gX9jsod6kny9NIAVSMr7zg0TgDGkp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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