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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '881f60694189a05f85f8f11d56b7ed5c9686e1385a79b587e1ff7a6bbd491823' 
  AND token = 'jPeSSUZFa9muj5+N8YP+Qcn5jJ6n9uP15NSoY41iFT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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