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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e077f5dad4a7e24f5d406459951e88273b95a069330eae734fe5bbc0078a8d79' 
  AND token = 'XbWuNBFDLyf7VjyCuU/Tp6tELEEuOEBaNEEdelyDM5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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