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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81b9f1252351b009d599fc7764030c32454a7390848c5c2a5705cd906364a2e5' 
  AND token = '32L6SjaLxaz4QsboHk1P3Olb1oii2S31cIP3tK3qKrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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