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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f581f982e166dc421c043f33f56dbc59d85c643362292800788bfc1d4b978fcd' 
  AND token = 'WpnoS6Vmv/Qe/Ym8QQrtvBGrdJbPz0p/+dXJrInue00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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