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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0099c739d334919fa9200af383869036dae8abe48785bbdd145e89a415e5e6a4' 
  AND token = 'kEfAn4A6RDLsMp+YSNMhyFfJfunxpflEf/opXOh4HcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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