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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd468cd652156b6e681e9585838486fde3d80a205f4dc6e6fd430f153c6f363a4' 
  AND token = '3a9ac/uKtfuzwi2yMc9WAmVr1TEqGmOYBhanZY4fDoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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