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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bf53b0b9c87aacccda4901d42ffb39d9222bbb4c7b328c76aeab86d1bf1f1b4' 
  AND token = 'XONAxpSstSjLIoROjLpfYB9ZueP6mx5OonXH41fUdK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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