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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2e5b8223a0f2e7f86a933b3d8976444aa4d2ddcb395410ef3cee893e0aa0a41' 
  AND token = 'xMmXcKQ90ngjKU+cvrsB55P2ccN1WBlEmE4phVQf9+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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