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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '933e6174406489a7a540906318defa5a5439f1591c0a720e9d1496e941185289' 
  AND token = 'jGa8cwQbUa0ZSgPeXLzkDWo2Tms0BB4GLGYU5osp3sM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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