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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26b416552232e2c584d60a65b773a915fc1b6f15998db0df0077e0dac27a9634' 
  AND token = 'Zb4VdmgsyzHnRR9QIvEypkHi0VIizoytY7kpnMd83a4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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