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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01ac71dbdcbeb974f92e1fa1525a4d2506c90c659244c610ead85ae487a10a31' 
  AND token = 'CZBy6dBTk4k5VsMjzLfk9oUPNLnE3emme8g+4Ex1TGg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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