SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '830d5845d5228da088519e5a3d512b86f9237f4815f206bd9a43f2e92b4698b7' 
  AND token = 'mW4x9+qQkxNmoam7LAvYC1GNpAVYDEh35z5g6FjfvyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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