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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73a596f4813c28f9b6830b30b868632d19bbc51f16ec7c45f83e5935be1b6d89' 
  AND token = 'zkA0kDn/PU8PViFHY3I/OZHqT13Y78Om3Fwq3lu0iBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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