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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6361c1485e44a79d3ac882058f09f48abba90f7f9b6d00fbbe451cd10717c69b' 
  AND token = 'xk1619EG8T3mv98Kq9zQQGGcfOtxe9GcIC3cqZiWBak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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