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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '828fbe3e2810a91071489239018320349926743d94bdf89ff2502a5c77415070' 
  AND token = 'YqHkRaOb9BIs+WrLQaWXn20nZkDAhg1NBadF4WTDm38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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