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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60336617556cb3e38b4c8c3de29de4786a54d2764efa26b21d4c1ebd9c905df9' 
  AND token = 'herA/WLUyvpLevt0uRDODUxokLF5Lj0GpjckJhvpnlw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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