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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5acf3821ed73647e98a6e44209e504d9b6796178850d78e25a06b741c892124b' 
  AND token = 'HHCMOqyHqQIGPZf3Ov9Kt4r8SpMY9QLdxrhE2Jqg7a8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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