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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '003be0f2f4be9d768b78a0d450dfbfbbc12b5cdf9cf7976170679591678e50a7' 
  AND token = 'KoIl5dTXIeDYseXyNHyffAg8WTB5RlfsuuaeyP8zT1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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