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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8224a178c5703e3119da07f7ac3c5a7fad2547a92ff16c41408dc3a6528d1a4c' 
  AND token = 'sKJO50tAc25ebSJMd0d8rqQ7EBa8QxlWhidMOAwZ28E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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