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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1da579ec7648c5efec4c76a8a966e06cfd17b96b6d3e56f9e295436de6b14a7b' 
  AND token = 'iHZEoPPx7X4T+9d6U0gCUWXE0WMUTrAsidVOgIzWEVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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