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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e68268544f789cd24cd6c8c666fb304c0c14fe61238a5f96f6677ce502d963c9' 
  AND token = '83J3a8BhEMNp3Mc3YE37srtuv5snqx5NGSP3n9MqASM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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