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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba062f524bef0edf3d696df7af0fc81dfb85be225d1e25510073384379d7bc5a' 
  AND token = 'OkkIMG2dOc75H7OsE3DZR7E39bP7uIqDf3B5PeFHJD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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