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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aeab0d68980b64c12065c9630a3c2c0874eb11c79dab4937417782db2005986f' 
  AND token = 'J3FMnsSj2p0IIfvom6QFI4D/ciHJEbI+68IO361FPZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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