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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35db5c683e7223032eceb51ea7e3b95efa6e067d6ca3edff73482c6b4d1ddd17' 
  AND token = 'YHQQFmHoWEYvtR/xbpvI3CE3Z+AVcqt4fD3hZ35mXPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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