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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8630781a50ccc22b91b026c9b3f97cebba8ed7365dcb3bc7c0e95800b48f852' 
  AND token = 'cJPdXoBi1UlAM0upZGlNUf4IG0wfMImUw0x8FX/6uhE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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