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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7da057764ec5326e85914de1e988d97e94cc5afdf4124d566ff7bc77da091ac6' 
  AND token = 'fVTNoq02H0xEtjHMlgMw9zcgO/+EwjGAYKVhE8meX08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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