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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fab64b3ab303dfbbf204fe19d1661bc23ad7a314156fddd2bc8c02abcb8c474' 
  AND token = 'QoginqflOph7bfzlY2RExjaSZyIrR0KIHPkNI54g1Ic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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