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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa8bc7f39e8defecde3f34f184a5a144d3f83a978e55ce73bc9010b5ade7188b' 
  AND token = 'fTQYcEuCh2HO1ImS4un2lEYcxFGHQr+sWbWo3bEUfZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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