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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c32a61b20ae49a096752be832a3c276b4202ad6d862d3ce49d010099c78b9e3c' 
  AND token = '8siy9FbG68iAAiS5vlMaO/Ify5qwFjPZzGqZnQKj0QU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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