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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '886c2ad500de7429cb5faa9b6002e4c491f7d9fdbf3d3aa5e1d00e5272c9a77f' 
  AND token = 'ghyAhF1R5zsSKlqIVsUjxaQkn4Eb0U2O2DzlkocLBFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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