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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51382d7c93b2250fcfeeaa57b329851568f3b95a1de085e584f3d37a6464c895' 
  AND token = 'yrkrkd7IfTGEEfnIVZ9pp68uhqcXupxqJmiTX2xnc3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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