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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '139a75ff63fc0ef759f02fc6ce4b37a5390956a22b35808478c1c64d0e2dba3d' 
  AND token = 'jel9fPNabnzrPC1A33OhXEaCVX9YXLo7Xdkap0F95yA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00083

JSON explain

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