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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b88eef8d344bfefa23675c816007fd8a71380cf134fee27526756379e5045da2' 
  AND token = 'UANsiXJjeKuUs3ulP/qbNfaEk25xknEgbDiJm9Petf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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