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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3da3e1a3020e1c797737c9b4ad35f94162dc10e4dce7bcfeac140423fb0e80e7' 
  AND token = 'DYo5oqNxHXtvCIVlmcyf5o5xx5enD/9WvDPwowAfJ1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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