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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cbe99ad0bf4366b011e019a548f2fc8bd0f4a7f8171be9b87191d31dd2e52ab' 
  AND token = 'QrUSbPyqBVfAOdjb8c3jAWldWQ3CerV9WtJcn3Oh5SY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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