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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d5f853f828fd33e6af02c8b643aed54cfcc3c26a404554d064a39c60082273c' 
  AND token = 'IFN754ia+2IspSc+c+hUMq7rAJS0T5MRbyVQkoYCa50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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