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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2f14e98e4cd4dc7489b4dee7b3bfb84c2f972ca76e125434d568d1bf1c41df7' 
  AND token = 'tmdhOorsT+v7rf3wtDXmq7JMmzs0UPLy9RPrA6KSqXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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