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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2b571ccb551e577ecb3650defb0785c8f22827e2df027aaf78f68aed3de802b' 
  AND token = 'EpB+jhoAx50BQvlcEsaysvkam6ROx7RNneFCk0I+p9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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