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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f2df365c31261a38133a251154e4aeac890989ad8c7f22fd37da930042ee9ac' 
  AND token = 'mSyUE0qEaOXN3pHmz/hwyEbf/Rez9SC3RQ8rD3khjvk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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