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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ceb08f2e1ed1982ed3bd688d3e39d9efb5c9f7081a562ce4787bfe204ff1bdd2' 
  AND token = 'TmCGH+Fg5BMUf2TCf2zLdXOVW3qvvGe+FB3vNNWcr80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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