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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '621bd88cae6e76462f8665f8edae00067c8c0b457828ce1424253d6ad254fb4f' 
  AND token = 'bZvVGuxNUbfdIHbrQikd5wYStdj5HpBdBRU+/A2JyQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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