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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5578ef80938e1322278c6eee66bc2a0824a277cf5dd6cc8181277214afe4cac7' 
  AND token = 'GQ88i5lEcyONafMtF3lQQuXM/vlIAjF8rK2RrWfLzhY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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