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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1e534c13bacb4e698f073e7c8ca32c92b568b68395fb88aa3d38c164484933d' 
  AND token = '5CJTlx5aMYTtuFF8uQoV03MyxqUk2AWqvi/5wRcVWEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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