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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ece4cfc469cc5b8d89980b9b7fe6d7bbeb87dd218ca0c04f30bc591eb287b36' 
  AND token = 'GWcA1xyTMRUyiOtEXZ0YkkiniAn8Vt+CchhEsduDI4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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