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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '849a6af4df08e51e9f7d9a38014675af0c42d5d314cd998a603ecf093cab3ec8' 
  AND token = 'uzLn2I7trnZGvDgVY6ZfkH9OfxAM3+QJ61szOg+pEls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00093

JSON explain

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