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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd60ed1c99cbc7e8b85540e18367ecbbf9cc585083e3e552ff259fc8cedc2082b' 
  AND token = 'Y3rYCzsKFRPeY/G6xXJGIwr50u+vwX+b9ANd3v3O66s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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