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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae4f218e814452c968b409a4a43062ed341254810f2ad583d706e20b53089e3d' 
  AND token = 'phbYtDCXIh/Hz+pv1tj4JdjQ8ZH8iNDMgIh4iDv24no=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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