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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5593e03b8a7852fa52d93b05ab27c782117cc303cdb6c047cfbd97a09d80f44b' 
  AND token = 'N8VuFfIVbNKB5EibZwgGyCLvczMAV12fY7EFwPIgvKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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