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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0a804ac6d6fe09c5251562cf4cdf02e5308214527c1ce727d2ce32cb96039f4' 
  AND token = 'ZSKy8W4HpZ8RxQGL6yhXZsplPJod6m3ZUeP/10bgKDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00072

JSON explain

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