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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0f6cdfb3d8eae60e81de444ca3f9ca9493a4f9be217c7ea896e2255f6c579f6' 
  AND token = '/qGkj5QSa2u6Ah9wJbWf7oPUMd/lBu5RXHe6Dy8kIbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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