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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3179f85296437becaafd1c0fd8361787f2cc0fcc2c0b8015399003373c41350f' 
  AND token = '395Yqc8Nm4veZu4U4+IWE9HQcLI+mKLjw1g9ClTVNts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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