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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91895dece1a83a4bf33277a2bd54c97015fe5ca2b63f19407172207bdab83862' 
  AND token = '2eKqipcHbH6Hj5Y0KBEyLuMxxXVzaWT2ZN2tLR5b8Ag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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